The binding sites of Sodium atom in the structure of Structure of A Trapped Endonuclease III-Dna Covalent Intermediate: Estranged-Adenine Complex (pdb code 1orp). This binding sites where shown with 5.0 Angstroms radius around Sodium atom. The 1orp structure was solved by J.C.FROMME, G.L.VERDINE, with X-Ray Crystallography technique, brief refinement statistics is given in the table below: